libvpx: Pull from upstream

source/libvpx/webmenc.c

+/*
+ *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "webmenc.h"
+
+#include <limits.h>
+#include <string.h>
+
+#include "third_party/libmkv/EbmlWriter.h"
+#include "third_party/libmkv/EbmlIDs.h"
+
+void Ebml_Write(struct EbmlGlobal *glob,
+                const void *buffer_in,
+                unsigned long len) {
+  (void) fwrite(buffer_in, 1, len, glob->stream);
+}
+
+#define WRITE_BUFFER(s) \
+for (i = len - 1; i >= 0; i--) { \
+  x = (char)(*(const s *)buffer_in >> (i * CHAR_BIT)); \
+  Ebml_Write(glob, &x, 1); \
+}
+
+void Ebml_Serialize(struct EbmlGlobal *glob,
+                    const void *buffer_in,
+                    int buffer_size,
+                    unsigned long len) {
+  char x;
+  int i;
+
+  /* buffer_size:
+   * 1 - int8_t;
+   * 2 - int16_t;
+   * 3 - int32_t;
+   * 4 - int64_t;
+   */
+  switch (buffer_size) {
+    case 1:
+      WRITE_BUFFER(int8_t)
+      break;
+    case 2:
+      WRITE_BUFFER(int16_t)
+      break;
+    case 4:
+      WRITE_BUFFER(int32_t)
+      break;
+    case 8:
+      WRITE_BUFFER(int64_t)
+      break;
+    default:
+      break;
+  }
+}
+#undef WRITE_BUFFER
+
+/* Need a fixed size serializer for the track ID. libmkv provides a 64 bit
+ * one, but not a 32 bit one.
+ */
+static void Ebml_SerializeUnsigned32(struct EbmlGlobal *glob,
+                                     unsigned int class_id,
+                                     uint64_t ui) {
+  const unsigned char sizeSerialized = 4 | 0x80;
+  Ebml_WriteID(glob, class_id);
+  Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1);
+  Ebml_Serialize(glob, &ui, sizeof(ui), 4);
+}
+
+static void Ebml_StartSubElement(struct EbmlGlobal *glob,
+                                 EbmlLoc *ebmlLoc,
+                                 unsigned int class_id) {
+  const uint64_t kEbmlUnknownLength = LITERALU64(0x01FFFFFF, 0xFFFFFFFF);
+  Ebml_WriteID(glob, class_id);
+  *ebmlLoc = ftello(glob->stream);
+  Ebml_Serialize(glob, &kEbmlUnknownLength, sizeof(kEbmlUnknownLength), 8);
+}
+
+static void Ebml_EndSubElement(struct EbmlGlobal *glob, EbmlLoc *ebmlLoc) {
+  off_t pos;
+  uint64_t size;
+
+  /* Save the current stream pointer. */
+  pos = ftello(glob->stream);
+
+  /* Calculate the size of this element. */
+  size = pos - *ebmlLoc - 8;
+  size |= LITERALU64(0x01000000, 0x00000000);
+
+  /* Seek back to the beginning of the element and write the new size. */
+  fseeko(glob->stream, *ebmlLoc, SEEK_SET);
+  Ebml_Serialize(glob, &size, sizeof(size), 8);
+
+  /* Reset the stream pointer. */
+  fseeko(glob->stream, pos, SEEK_SET);
+}
+
+void write_webm_seek_element(struct EbmlGlobal *ebml,
+                             unsigned int id,
+                             off_t pos) {
+  uint64_t offset = pos - ebml->position_reference;
+  EbmlLoc start;
+  Ebml_StartSubElement(ebml, &start, Seek);
+  Ebml_SerializeBinary(ebml, SeekID, id);
+  Ebml_SerializeUnsigned64(ebml, SeekPosition, offset);
+  Ebml_EndSubElement(ebml, &start);
+}
+
+void write_webm_seek_info(struct EbmlGlobal *ebml) {
+  off_t pos;
+  EbmlLoc start;
+  EbmlLoc startInfo;
+  uint64_t frame_time;
+  char version_string[64];
+
+  /* Save the current stream pointer. */
+  pos = ftello(ebml->stream);
+
+  if (ebml->seek_info_pos)
+    fseeko(ebml->stream, ebml->seek_info_pos, SEEK_SET);
+  else
+    ebml->seek_info_pos = pos;
+
+  Ebml_StartSubElement(ebml, &start, SeekHead);
+  write_webm_seek_element(ebml, Tracks, ebml->track_pos);
+  write_webm_seek_element(ebml, Cues, ebml->cue_pos);
+  write_webm_seek_element(ebml, Info, ebml->segment_info_pos);
+  Ebml_EndSubElement(ebml, &start);
+
+  /* Create and write the Segment Info. */
+  if (ebml->debug) {
+    strcpy(version_string, "vpxenc");
+  } else {
+    strcpy(version_string, "vpxenc ");
+    strncat(version_string,
+            vpx_codec_version_str(),
+            sizeof(version_string) - 1 - strlen(version_string));
+  }
+
+  frame_time = (uint64_t)1000 * ebml->framerate.den
+               / ebml->framerate.num;
+  ebml->segment_info_pos = ftello(ebml->stream);
+  Ebml_StartSubElement(ebml, &startInfo, Info);
+  Ebml_SerializeUnsigned(ebml, TimecodeScale, 1000000);
+  Ebml_SerializeFloat(ebml, Segment_Duration,
+                      (double)(ebml->last_pts_ms + frame_time));
+  Ebml_SerializeString(ebml, 0x4D80, version_string);
+  Ebml_SerializeString(ebml, 0x5741, version_string);
+  Ebml_EndSubElement(ebml, &startInfo);
+}
+
+void write_webm_file_header(struct EbmlGlobal *glob,
+                            const vpx_codec_enc_cfg_t *cfg,
+                            const struct vpx_rational *fps,
+                            stereo_format_t stereo_fmt,
+                            unsigned int fourcc) {
+  EbmlLoc start;
+  EbmlLoc trackStart;
+  EbmlLoc videoStart;
+  unsigned int trackNumber = 1;
+  uint64_t trackID = 0;
+  unsigned int pixelWidth = cfg->g_w;
+  unsigned int pixelHeight = cfg->g_h;
+
+  /* Write the EBML header. */
+  Ebml_StartSubElement(glob, &start, EBML);
+  Ebml_SerializeUnsigned(glob, EBMLVersion, 1);
+  Ebml_SerializeUnsigned(glob, EBMLReadVersion, 1);
+  Ebml_SerializeUnsigned(glob, EBMLMaxIDLength, 4);
+  Ebml_SerializeUnsigned(glob, EBMLMaxSizeLength, 8);
+  Ebml_SerializeString(glob, DocType, "webm");
+  Ebml_SerializeUnsigned(glob, DocTypeVersion, 2);
+  Ebml_SerializeUnsigned(glob, DocTypeReadVersion, 2);
+  Ebml_EndSubElement(glob, &start);
+
+  /* Open and begin writing the segment element. */
+  Ebml_StartSubElement(glob, &glob->startSegment, Segment);
+  glob->position_reference = ftello(glob->stream);
+  glob->framerate = *fps;
+  write_webm_seek_info(glob);
+
+  /* Open and write the Tracks element. */
+  glob->track_pos = ftello(glob->stream);
+  Ebml_StartSubElement(glob, &trackStart, Tracks);
+
+  /* Open and write the Track entry. */
+  Ebml_StartSubElement(glob, &start, TrackEntry);
+  Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber);
+  glob->track_id_pos = ftello(glob->stream);
+  Ebml_SerializeUnsigned32(glob, TrackUID, trackID);
+  Ebml_SerializeUnsigned(glob, TrackType, 1);
+  Ebml_SerializeString(glob, CodecID,
+                       fourcc == VP8_FOURCC ? "V_VP8" : "V_VP9");
+  Ebml_StartSubElement(glob, &videoStart, Video);
+  Ebml_SerializeUnsigned(glob, PixelWidth, pixelWidth);
+  Ebml_SerializeUnsigned(glob, PixelHeight, pixelHeight);
+  Ebml_SerializeUnsigned(glob, StereoMode, stereo_fmt);
+  Ebml_EndSubElement(glob, &videoStart);
+
+  /* Close Track entry. */
+  Ebml_EndSubElement(glob, &start);
+
+  /* Close Tracks element. */
+  Ebml_EndSubElement(glob, &trackStart);
+
+  /* Segment element remains open. */
+}
+
+void write_webm_block(struct EbmlGlobal *glob,
+                      const vpx_codec_enc_cfg_t *cfg,
+                      const vpx_codec_cx_pkt_t *pkt) {
+  unsigned int block_length;
+  unsigned char track_number;
+  uint16_t block_timecode = 0;
+  unsigned char flags;
+  int64_t pts_ms;
+  int start_cluster = 0, is_keyframe;
+
+  /* Calculate the PTS of this frame in milliseconds. */
+  pts_ms = pkt->data.frame.pts * 1000
+           * (uint64_t)cfg->g_timebase.num / (uint64_t)cfg->g_timebase.den;
+
+  if (pts_ms <= glob->last_pts_ms)
+    pts_ms = glob->last_pts_ms + 1;
+
+  glob->last_pts_ms = pts_ms;
+
+  /* Calculate the relative time of this block. */
+  if (pts_ms - glob->cluster_timecode > SHRT_MAX)
+    start_cluster = 1;
+  else
+    block_timecode = (uint16_t)pts_ms - glob->cluster_timecode;
+
+  is_keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY);
+  if (start_cluster || is_keyframe) {
+    if (glob->cluster_open)
+      Ebml_EndSubElement(glob, &glob->startCluster);
+
+    /* Open the new cluster. */
+    block_timecode = 0;
+    glob->cluster_open = 1;
+    glob->cluster_timecode = (uint32_t)pts_ms;
+    glob->cluster_pos = ftello(glob->stream);
+    Ebml_StartSubElement(glob, &glob->startCluster, Cluster);
+    Ebml_SerializeUnsigned(glob, Timecode, glob->cluster_timecode);
+
+    /* Save a cue point if this is a keyframe. */
+    if (is_keyframe) {
+      struct cue_entry *cue, *new_cue_list;
+
+      new_cue_list = realloc(glob->cue_list,
+                             (glob->cues + 1) * sizeof(struct cue_entry));
+      if (new_cue_list)
+        glob->cue_list = new_cue_list;
+      else
+        fatal("Failed to realloc cue list.");
+
+      cue = &glob->cue_list[glob->cues];
+      cue->time = glob->cluster_timecode;
+      cue->loc = glob->cluster_pos;
+      glob->cues++;
+    }
+  }
+
+  /* Write the Simple Block. */
+  Ebml_WriteID(glob, SimpleBlock);
+
+  block_length = (unsigned int)pkt->data.frame.sz + 4;
+  block_length |= 0x10000000;
+  Ebml_Serialize(glob, &block_length, sizeof(block_length), 4);
+
+  track_number = 1;
+  track_number |= 0x80;
+  Ebml_Write(glob, &track_number, 1);
+
+  Ebml_Serialize(glob, &block_timecode, sizeof(block_timecode), 2);
+
+  flags = 0;
+  if (is_keyframe)
+    flags |= 0x80;
+  if (pkt->data.frame.flags & VPX_FRAME_IS_INVISIBLE)
+    flags |= 0x08;
+  Ebml_Write(glob, &flags, 1);
+
+  Ebml_Write(glob, pkt->data.frame.buf, (unsigned int)pkt->data.frame.sz);
+}
+
+void write_webm_file_footer(struct EbmlGlobal *glob, int hash) {
+  EbmlLoc start_cues;
+  EbmlLoc start_cue_point;
+  EbmlLoc start_cue_tracks;
+  unsigned int i;
+
+  if (glob->cluster_open)
+    Ebml_EndSubElement(glob, &glob->startCluster);
+
+  glob->cue_pos = ftello(glob->stream);
+  Ebml_StartSubElement(glob, &start_cues, Cues);
+
+  for (i = 0; i < glob->cues; i++) {
+    struct cue_entry *cue = &glob->cue_list[i];
+    Ebml_StartSubElement(glob, &start_cue_point, CuePoint);
+    Ebml_SerializeUnsigned(glob, CueTime, cue->time);
+
+    Ebml_StartSubElement(glob, &start_cue_tracks, CueTrackPositions);
+    Ebml_SerializeUnsigned(glob, CueTrack, 1);
+    Ebml_SerializeUnsigned64(glob, CueClusterPosition,
+                             cue->loc - glob->position_reference);
+    Ebml_EndSubElement(glob, &start_cue_tracks);
+
+    Ebml_EndSubElement(glob, &start_cue_point);
+  }
+
+  Ebml_EndSubElement(glob, &start_cues);
+
+  /* Close the Segment. */
+  Ebml_EndSubElement(glob, &glob->startSegment);
+
+  /* Patch up the seek info block. */
+  write_webm_seek_info(glob);
+
+  /* Patch up the track id. */
+  fseeko(glob->stream, glob->track_id_pos, SEEK_SET);
+  Ebml_SerializeUnsigned32(glob, TrackUID, glob->debug ? 0xDEADBEEF : hash);
+
+  fseeko(glob->stream, 0, SEEK_END);
+}